#include <vector>
#include <iostream>
#include <string>
#include <sstream>
#include <iterator>
#include <mutex>
#include <unordered_map>
#include <random>
using namespace std;

int main()
{
    
    std::vector<int> a;
    a.push_back(1);
    a.push_back(3);
    a.push_back(5);
    cout<<std::vector<int>(a.begin(),a.begin()+2).size()<<endl;
    cout<<a.size()<<endl;
    return 0;
}